WO2014077143A1 - Terminal fitting-equipped electrical wire - Google Patents

Abstract

A terminal fitting-equipped braided wire (10) is provided with a female terminal (30) that comprises copper or a copper alloy and that is connected to a braided wire (20) formed by braiding a plurality of copper or copper alloy wires (21), and is characterized in that: the wires (21) are plated with tin; and a conductor connecting section (22) and an electrical wire fixing section (32) are electrically connected and fixed by using tin and pressing the conductor connecting section (22) that is provided to the end of the braided wire (20) and the electrical wire fixing section (32) that is provided to the female terminal (30) while heating at a temperature within the range of 250-1000 °C.

Description

Electric wire with terminal bracket

The present invention relates to an electric wire with a terminal fitting.

Conventionally, a wire described in Patent Document 1 is known as an electric wire with a terminal fitting in which a terminal is connected to an electric wire formed by covering a core wire composed of a plurality of metal wires with a covering. In this electric wire with terminal fitting, the brazing material is placed on the terminal fitting, and the core wire of the electric wire is superposed on the brazing material and heated to electrically connect the terminal fitting and the core wire with the brazing material. is doing.

JP 2011-124178 A

By the way, according to the electric wire with the terminal fitting as described above, since the brazing material is required to electrically connect the terminal fitting and the core wire of the electric wire, the raw material cost of the brazing material is increased and the brazing material is mounted. The manufacturing cost of the electric wire with a terminal metal fitting will become high, such as the work process for placing it increases. Further, when connecting the terminal fitting and the core wire with the brazing material, there is a risk that workability for connecting the terminal fitting and the core wire may be lowered, such as forgetting to place the brazing material on the terminal fitting.

The present invention has been completed based on the above situation, and an object thereof is to electrically connect a terminal fitting and an electric wire without using a brazing material.

As a means for achieving the above object, the present invention provides an electric wire with a terminal fitting in which a terminal fitting made of copper or copper alloy is connected to a conductor made of a plurality of copper or copper alloy strands, The element wire is tin-plated, and by heating the element wire and the terminal fitting in a range of 250 ° C. or more and 1000 ° C. or less while pressurizing the element wire and the terminal fitting, the element wire and the terminal fitting are electrically connected with tin. It is characterized by being connected and secured.
According to such a configuration, by heating the copper element wire and the terminal fitting to 250 ° C. or higher, which is higher than the melting point of the tin material, the plated tin is melted to prevent oxidation of the element wire, and the copper A strand and a terminal metal fitting can be fixed. Thereby, a terminal metal fitting and an electric wire can be electrically connected, without using brazing material, and the manufacturing cost of an electric wire with a terminal metal fitting can be reduced. Further, it is possible to prevent a decrease in connection workability due to misplacement of the brazing material.

The following configuration is preferable as an embodiment of the present invention.
The conductor may be a braided wire formed by weaving the strands.
The braided wire is generally formed by braiding thin tin-plated strands, so that when the strands are heated while being pressed as in the above configuration, the tin is firmly attached between the strands and the terminal fittings. And an electric wire with terminal fittings in which tin has entered without any gap between the strands. Thereby, it can maintain in the state to which the strand and the terminal metal fitting were firmly fixed, making it into the state gathered, without breaking a strand.

The terminal fitting may be configured to be tin-plated.
According to such a configuration, since the tin of the terminal fitting can enter between the strand and the terminal fitting in addition to the tin of the strand, the terminal fitting and the strand can be more securely fixed. .

According to the present invention, the terminal fitting and the electric wire can be electrically connected without using a brazing material.

The perspective view of the electric wire with a terminal metal fitting in Embodiment 1 Sectional drawing which shows the state before welding a terminal metal fitting and a braided wire Sectional drawing which shows the state which welded and fixed the terminal metal fitting and the braided wire Terminal metal perspective view Sectional drawing equivalent to FIG. 3 in Embodiment 2 Sectional drawing equivalent to FIG. 3 in Embodiment 3 Sectional drawing equivalent to FIG. 3 in Embodiment 4 Sectional drawing equivalent to FIG. 3 in other embodiment Sectional drawing equivalent to FIG. 3 in other embodiment Sectional drawing equivalent to FIG. 3 in other embodiment Sectional drawing equivalent to FIG. 3 in other embodiment

<Embodiment 1>
Embodiment 1 of the present invention will be described with reference to FIGS.
In this embodiment, as shown in FIG. 1, a female terminal (an example of a “terminal fitting”) 30 is electrically connected to a terminal of a braided wire (an example of a “conductor”) 20 by welding. A braided wire with a terminal fitting (an example of a “wire with a terminal fitting”) 10 is illustrated. In the following description, the vertical direction refers to the vertical direction in FIG. 2, and the front-back direction refers to the right back side in FIG. 1 as the front and the left front side as the back.

The female terminal 30 is formed by pressing a plate made of copper or a copper alloy. As shown in FIGS. 1 and 4, the rectangular tube-shaped connecting tube portion 31 and the bottom plate 31 </ b> A in the connecting tube portion 31 are formed. And a wire adhering portion 32 connected to the rear of the device. A plurality of elastic pieces 33 are provided in the connection cylinder portion 31, and these elastic pieces 33 elastically contact a male terminal (not shown) inserted into the connection cylinder portion 31, thereby allowing female terminals 30 and the male terminal are electrically connected.
The wire fixing portion 32 has a flat plate shape, and a tin plating layer (not shown) is formed on the surface of the wire fixing portion 32 by tin plating.

The braided wire 20 has a cylindrical shape, and as shown in FIG. 1, a plurality of thin strands 21 made of copper or copper alloy are woven into a mesh shape. Similar to the wire fixing part, a tin plating layer (not shown) is formed on the surface of the strand 21 by applying tin plating, and oxidation of the strand 21 and generation of rust are suppressed. The terminal of the braided wire 20 is provided with a conductor connecting portion 22 that is electrically connected to the wire fixing portion 32 of the female terminal 30 by resistance welding. As shown in FIG. 2, the conductor connecting portion 22 has a hollow shape before welding, but is placed on the upper surface of the wire fixing portion 32 and resistance-welded, so that FIG. 1 and FIG. As shown in FIG. 3, it is fixed by molten tin from the tinned layer of the wire fixing portion 32 and the wire 21, and is fixed to the wire fixing portion 32 in a wide solid shape.

As shown in FIGS. 1 and 3, the conductor connecting portion 22 includes a preceding fixing portion 23 that is welded and fixed to the wire fixing portion 32 in advance of the conductor connecting portion 22, and a preceding fixing portion 23. And a subsequent fixing portion 24 which is welded and fixed to the electric wire fixing portion 32.
The preceding fixing portion 23 is provided at both side edges in the width direction of the conductor connecting portion 22. The thicknesses in the vertical direction of the two preceding fixing portions 23 are formed to be the smallest in the thickness dimension in the vertical direction of the conductor connecting portion 22, and the upper surface of the preceding fixing portion 23 is the wire fixing portion 32. It is formed so as to be substantially parallel to the upper surface.
The subsequent fixing portion 24 is provided between the two preceding fixing portions 23 and is continuous with the two preceding fixing portions 23 in the width direction. Further, the upper portion of the succeeding fixing portion 24 has a shape that bulges upward in an arc shape, and is formed so that the thickness dimension in the vertical direction of the substantially central portion in the width direction is maximized. That is, the upper surface of the subsequent fixing portion 24 has a form that bulges above the upper surface of the preceding fixing portion 23 between the two preceding fixing portions 23.

Next, the manufacturing method which manufactures the braided wire 10 with a terminal metal fitting is demonstrated.
In order to connect the female terminal 30 and the braided wire 20 by resistance welding, the female terminal 30 is first set in the welding apparatus 50.
As shown in FIGS. 2 and 3, the welding apparatus 50 includes a pair of upper and lower electrodes 51 and 52, and the upper surface 52A of the lower electrode 52 disposed on the lower side is formed flat. On the other hand, the upper electrode 51 disposed on the upper side is arranged to face the lower electrode 52. The upper electrode 51 includes a pair of preceding welded portions 53 formed at the lower end edges on both sides in the width direction and an escape recess 54 provided between the pair of preceding welded portions 53. The pair of preceding welded portions 53 are disposed at the lowermost end of the upper electrode 51, and the lower surface of the preceding welded portion 53 is disposed to face the upper surface 52 </ b> A of the lower electrode 52. The relief recess 54 has a shape that is concaved in an arc shape toward the upper side so as to be continuous with the pair of preceding welds 53 in the width direction, and is formed so that the center portion in the width direction is deepest.

When the female terminal 30 is set in the welding apparatus 50, the wire fixing portion 32 of the female terminal 30 is placed on the upper surface 52A of the lower electrode 52 as shown in FIG. At this time, since the wire fixing portion 32 has a flat shape, the wire fixing portion 32 is in surface contact with the lower electrode 52. Further, when the female terminal 30 is disposed on the upper surface 52A of the lower electrode 52, the pair of guide portions 55 are disposed so as to sandwich the wire fixing portion 32 from both sides in the width direction.

Next, the conductor connecting portion 22 of the braided wire 20 is placed on the upper surface of the wire fixing portion 32, and the upper electrode 51 placed above the conductor connecting portion 22 is pressed from above.
As a result, as shown in FIG. 3, the conductor connecting portion 22 and the wire fixing portion 32 are sandwiched and pressed in the vertical direction by the lower electrode 52 and the upper electrode 51. Here, when the conductor connecting portion 22 and the wire fixing portion 32 are pressurized, the conductor connecting portion 22 is crushed at the substantially central portion in the width direction of the conductor connecting portion 22 and spreads to both sides in the width direction. On the other hand, it is clamped in the up-down direction by the pair of electrodes 51, 52. For this reason, if the lower surface of the upper electrode is formed flat, the wires of the conductor connecting portion are scattered and widen in the width direction, and the wires spill outside from the upper surface of the wire fixing portion. There is a fear. However, in the present embodiment, the substantially central portion in the width direction (subsequent fixing portion 24) of the conductor connecting portion 22 escapes to the upper electrode 51 and is accommodated in the concave portion 54 so as to be sandwiched between the electrodes 51 and 52. Compared to the case where the lower surface is flat, the conductor connecting portion 22 can be held between the electrodes 51 and 52 while relaxing the conductor connecting portion 22 from spreading in the width direction. That is, the wire 21 of the conductor connecting portion 22 can be prevented from protruding outside from both sides in the width direction of the wire fixing portion 32.

Further, when the conductor connecting portion 22 is sandwiched in the vertical direction by the upper electrode 51 and the lower electrode 52 and pressed, the both side edges (preceding fixing portion 23) in the width direction of the conductor connecting portion 22 are paired. , And the thickness dimension in the vertical direction is the smallest among the conductor connecting portions 22.

Next, a current is passed between the electrodes 51 and 52 while the conductor connecting portion 22 and the wire fixing portion 32 are sandwiched between the electrodes 51 and 52 in the vertical direction, and the conductor connecting portion 22 and the wire fixing portion 32 are connected. Is heated in the range of 250 ° C. or higher and 1000 ° C. or lower. Here, when the heating temperature exceeds 231.9 ° C., which is the melting point of tin, tin is melted from the tin plating layer formed on the wire 21 and the wire fixing portion 32 of the conductor connection portion 22. And in the state whose heating temperature is 250 degreeC or more, while it will be in the state which the molten tin entered into the clearance gap between the strands 21 reliably, it approached reliably between the electric wire fixing | fixed part 32 and the conductor connection part 22. FIG. It will be in the state. Thereby, the electric wire fixing | fixed part 32 and the conductor connection part 22 can be stuck firmly. In addition, since heating temperature is set lower than melting | fusing point of copper, it can prevent that the conductor connection part 22 and the electric wire adhering part 32 fuse | melt.

Further, in this heating process, the thickness dimension of both side edges in the width direction in the conductor connecting portion 22 is made the smallest, and the distance between the electrodes 51 and 52 at the position where the pair of preceding welded portions 53 are arranged is the largest. Compared to other portions of the conductor connecting portion 22, the electric charges are concentrated on both side edges in the width direction of the conductor connecting portion 22, so that both side edges in the width direction of the conductor connecting portion 22 are preceded. And can be heated. That is, as compared with the other portions of the conductor connecting portion 22, the both sides of the width direction of the conductor connecting portion 22 can be brought into close contact with the wire fixing portion 32 to form the preceding fixing portion 23. Thereby, before the strand 21 spills from the wire fixing part 32, the preceding fixing part 23 can be brought into close contact with the wire fixing part 32 as soon as possible.
Then, after both of the preceding fixing portions 23 are in close contact with the wire fixing portion 32, the conductor connecting portion 22 accommodated in the relief recess 54 of the upper electrode 51 is in close contact with the electric wire fixing portion 32 to form the subsequent fixing portion 24. The Thereby, the conductor connecting portion 22 and the wire fixing portion 32 can be firmly adhered without spilling the strand 21 of the conductor connecting portion 22 from the upper surface of the wire fixing portion 32.

Finally, when the entire conductor connecting portion 22 is in close contact with the electric wire fixing portion 32 by the tin, the electric wire fixing portion 32 and the electric conductor connecting portion 22 are cooled and the tin is hardened so that the electric wire fixing portion 32 and the electric conductor are cured. The connecting portion 22 is electrically connected and fixed, and the braided wire 10 with terminal fitting is completed.

As described above, according to the present embodiment, the plated tin is melted to prevent oxidation of the element wire 21 and the wire fixing portion 32, and the conductor connecting portion 22 and the wire fixing portion 32 are fixed. Therefore, the braided wire 20 and the female terminal 30 can be electrically connected without using a brazing material. As a result, it is possible to prevent the connection workability from being lowered due to misplacement of the brazing material, and to reduce the manufacturing cost of the braided wire 10 with terminal fittings.

Further, according to the present embodiment, when the thickness of the preceding fixing portion 23 is made the smallest in the conductor connecting portion 22 and current is passed between the electrodes 51 and 52, the electric charge is concentrated on the leading fixing portion 23. Therefore, the preceding fixing portion 23 can be brought into close contact with the other portion of the conductor connecting portion 22 (the subsequent fixing portion 24) in advance. Further, when the conductor connecting portion 22 is sandwiched between the electrodes 51 and 52, the subsequent fixing portion 24 accommodated in the relief recess 54 of the upper electrode 51 is provided, so that the conductor connecting portion 22 is arranged in the width direction. Can spread out.
Thereby, before the strand 21 of the conductor connection part 22 spills from the wire fixing part 32, the conductor connection part 22 and the wire fixing part 32 can be fixed firmly.

In addition, when using a braided wire for an electric wire as in the present embodiment, since the thin strands are knitted and formed, the strands are likely to be separated. May gradually come apart. However, according to the present embodiment, since tin is firmly entered into the gap between the conductor connecting portion 22 and the wire fixing portion 32 or between the strands 21, while maintaining the braided wire 20 in a bundled state. Further, the connection reliability can be ensured by firmly fixing the conductor connecting portion 22 and the wire fixing portion 32. That is, it is very effective when a braided wire is used.

<Embodiment 2>
Next, Embodiment 2 of the present invention will be described with reference to FIG.
The braided wire 11 with terminal metal fittings of the second embodiment is obtained by changing the shape of the subsequent fixing portion 24 in the first embodiment, and the configuration, operation, and effect common to the first embodiment are duplicated, and therefore the description thereof is omitted. Is omitted. The same reference numerals are used for the same configurations as those in the first embodiment.

In the second embodiment, the subsequent fixing portion 70 differs from the first embodiment in that the shape of the upper portion of the subsequent fixing portion 70 bulges upward in a substantially rectangular shape. Specifically, as shown in FIG. 5, the cross-sectional shape of the upper portion of the subsequent fixing portion 70 rises straight upward from the inner upper end portions of the two preceding fixing portions 23 and connects these upper end portions in the width direction. It is said that. That is, the cross-sectional shape of the relief recess 57 provided in the upper electrode 51 of the second embodiment is substantially rectangular, and the preceding welds 58 provided on both sides of the upper electrode 51 in the width direction are the other parts of the upper electrode 51. Compared to the portion, the shape protrudes downward.

That is, when the conductor connecting portion 22 and the wire fixing portion 32 of the braided wire 20 are sandwiched in the vertical direction by both electrodes 51 and 52 and heated in the range of 250 ° C. or more and 1000 ° C. or less, the conductor connecting portion 22. The thickness dimension of both side edges in the width direction (preceding adhering portion 23) is reliably smaller than the other portions by the amount by which the preceding welded portion 58 protrudes downward. In other words, compared to the other parts of the conductor connecting part 22, the electric charges are concentrated on the two preceding fixing parts 23 of the conductor connecting part 22, and the two preceding fixing parts 23 are more securely brought into close contact than the other parts. Can be made. Further, since the succeeding fixing portion 70 has risen from the inner end portion of the preceding fixing portion 23, for example, compared to the succeeding fixing portion that gently bulges upward from the position of the upper surface of the preceding fixing portion. Further, it is possible to further alleviate the spreading of the conductor connecting portion 22 in the width direction.
As a result, the manufacturing cost of the braided wire 11 with terminal fittings can be reduced, and the conductive wire 21 is not spilled from the wire fixing portion 32 or the braided wire 20 and the female terminal 30 are not weakened. The body connecting portion 22 and the wire fixing portion 32 can be firmly fixed and electrically connected.

<Embodiment 3>
Next, Embodiment 3 of the present invention will be described with reference to FIG.
The braided wire 12 with terminal fittings of the third embodiment is obtained by changing the shape of the wire fixing portion 32 and the shape of the subsequent fixing portion 24 in the first embodiment. Since the effect is duplicated, its description is omitted. The same reference numerals are used for the same configurations as those in the first embodiment.

The electric wire fixing portion 34 in the third embodiment is a pair of flat plate portions 35 with both side edges in the width direction slightly extending in the width direction, and the flat plate portions 35 are connected in a circular arc shape between the pair of flat plate portions 35. The bulging portion 36 bulges downward.
On the other hand, the subsequent fixing portion 71 is substantially the same as the shape obtained by inverting the shape of Embodiment 1 upside down, and the lower portion of the subsequent fixing portion 71 corresponds to the shape of the bulging portion 36 of the wire fixing portion 34. It bulges downward.

That is, in the welding apparatus 50 of the present embodiment, the lower surface 151A of the upper electrode 151 is a flat surface, and the relief that is recessed downward on the upper surface of the lower electrode 152 along the shape of the wire fixing portion 34. A recess 154 is provided. When the electric wire fixing part 34 and the conductor connecting part 22 are sandwiched between the electrodes 151 and 152 in the vertical direction, the center part in the width direction (subsequent fixing part 71) of the electric conductor connecting part 22 is It is accommodated in the escape recess 154 together with the bulging portion 36, and the conductor connecting portion 22 is alleviated from spreading in the width direction. At the same time, the thickness dimension in the vertical direction of both side edges in the width direction of the conductor connecting portion 22 is the smallest compared to the thickness dimension of other portions of the conductor connecting portion 22.
And while sandwiching the conductor connecting portion 22 and the wire fixing portion 34 between the electrodes 151 and 152, by heating in a range of 250 ° C. or more and 1000 ° C. or less, both side edges in the width direction of the conductor connecting portion 22 are formed. A pair of preceding fixing portions 23 are formed in close contact with the wire fixing portion 34, and then a substantially central portion in the width direction of the conductor connecting portion 22 is in close contact with the wire fixing portion 34 to form a subsequent fixing portion 71. The

That is, also in this embodiment, not only the manufacturing cost of the braided wire 12 with terminal fittings is reduced, but also the strand 21 is spilled from the wire fixing portion 34, or the braided wire 20 and the female terminal 30 are made weak. Without this, the conductor connecting portion 22 and the wire fixing portion 34 can be firmly fixed and electrically connected.

<Embodiment 4>
Next, a fourth embodiment of the present invention will be described with reference to FIG.
The braided wire 13 with terminal metal fittings of the fourth embodiment is obtained by changing the shape of the conductor connecting portion 22 in the first embodiment, and the configuration, operation, and effect common to the first embodiment are duplicated. Description is omitted. The same reference numerals are used for the same configurations as those in the first embodiment.

In the conductor connecting portion 25 according to the fourth embodiment, between the pair of preceding fixing portions 23 provided at both ends in the width direction, a pair of subsequent fixing portions 73 bulging upward in an arc shape are arranged in the width direction. A central fixing portion 26 is formed between the pair of subsequent fixing portions 73 and provided at substantially the same height as the preceding fixing portion 23.

Therefore, according to the present embodiment, the central fixing portion 26 comes into close contact with the electric wire fixing portion 32 at substantially the same timing as when the preceding fixing portion 23 comes into close contact with the electric wire fixing portion 32.
That is, for example, when trying to weld a conductor connecting portion having a large amount of radiation to a wide wire fixing portion, the conductor connecting portion can be sufficiently made into a wire fixing portion with only a pair of preceding fixing portions formed at both ends in the width direction. Although there is a possibility that welding cannot be performed, according to the present embodiment, since the central fixing portion 26 is provided in the central portion in the width direction, the conductor connecting portion 25 can be firmly fixed to the electric wire fixing portion 32.

<Other embodiments>
The present invention is not limited to the embodiments described with reference to the above description and drawings. For example, the following embodiments are also included in the technical scope of the present invention.
(1) In the first embodiment, the upper portion of the subsequent fixing portion 24 is configured to bulge upward in an arc shape. However, the present invention is not limited to such a mode. For example, As shown in FIG. 8, you may comprise in the form which the upper part of the subsequent adhering part 72 swelled in the shape of a triangle.
(2) In the third embodiment, the lower portion of the subsequent fixing portion 71 and the bulging portion 36 of the electric wire fixing portion 34 are configured to bulge downward in an arc shape. For example, as shown in FIG. 9, the lower portion of the subsequent fixing portion 74 and the bulging portion 37 may be formed in a rectangular shape, as shown in FIG. 10. The lower portion of the subsequent fixing portion 75 and the bulging portion 38 may be configured to bulge downward in a triangular shape. Further, as shown in FIG. 11, a plurality of subsequent fixing portions 76 and bulging portions 39 may be arranged in the width direction between the pair of preceding fixing portions 23.

(3) In the said embodiment, although it was set as the structure applied to the braided wire 20, this invention is not limited to such an aspect, For example, even if it applies to the electric wire etc. which make a strand wire a core wire, etc. Good.
(4) In the above-described embodiment, the configuration is applied to the female terminal 30, but the present invention is not limited to such an embodiment, and may be applied to, for example, a male terminal or an LA terminal. Good.
(5) In the above embodiment, the wire fixing portion while holding both side edges in the width direction of the conductor connecting portion 22 and the substantially central portion in the width direction of the conductor connecting portion 22 at the same time between the electrodes 51, 52, 151, 152. Although the preceding fixing portion 23 and the subsequent fixing portions 24, 70, 71 are fixed to the 32, 34, the present invention is not limited to such an embodiment. For example, first, only the both side edges in the width direction of the conductor connecting portion are fixed to the wire fixing portion while being sandwiched between both electrodes to form the preceding fixing portion, and then the substantially central portion in the width direction of the conductor connecting portion is You may make it the structure which is made to adhere to an electric wire fixing | fixed part, and to form a subsequent fixed part, pinching | interposing with an electrode.
(6) In the above embodiment, the conductor connecting portion 22 is configured to be in close contact with both sides in the width direction, but the present invention is not limited to such an embodiment. For example, the conductor connecting portion The whole 22 may be configured to be in close contact with each other at the same time, or the substantially central portion in the width direction of the conductor connecting portion 22 may be configured to be in close contact in advance.
(7) In the above embodiment, a tin plating layer is formed on the surfaces of the wire fixing portions 32, 34. However, the present invention is not limited to such an embodiment. It is good also as a structure which formed the silver plating layer or the gold plating layer.

10, 11, 12: Braided wire with terminal fitting (electric wire with terminal fitting)
20: Braided wire (conductor)
21: Wire 30: Female terminal (terminal fitting)

Claims (3)

It is an electric wire with a terminal fitting in which a terminal fitting made of copper or a copper alloy is connected to a conductor made of a plurality of copper or copper alloy wires,
The wire is tin-plated,
With a terminal fitting in which the element wire and the terminal fitting are electrically connected and fixed by tin by heating in a range of 250 ° C. or more and 1000 ° C. or less while pressurizing the strand and the terminal fitting. Electrical wire. The electric wire with terminal fitting according to claim 1, wherein the conductor is a braided wire formed by weaving the strands. 3. The electric wire with terminal fitting according to claim 1 or 2, wherein the terminal fitting is tin-plated.

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